<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>border 边框</title>
		<style>
			
		div {
			width: 300px;
			height: 300px;
			border-top:20px solid red ;
			background-color: yellow;
			border: 30px solid red;
			/*border-image: url(img/image-01.jpg);*/
			
			/*border: 1px;*/    /*使用border是混合模式默认设置的是四个方向上的边框都进行显示*/
		}
			
		</style>
	</head>
	<body>
		<div class="border">
			
			
		</div>
	</body>
</html>
